Wire transposing device



Nov. 30, 1948. R. CASE WIRE TRANSPOSING DEVICE Filed April 6, 1944INVENTOR 1? 056115 C 0358 Patented Nov. 30, 1948 WIRE TRAN SPOSINGDEVICE Rogers Case, Orange, N. J., assignor to Transadean Associates,Inc., New York, N. Y., a corporation of Delaware Application April 6,1944, Serial No. 529,806

(Cl. I'M-33) i 2 Claims.

This invention relates to a device for transpos- 'ing the wires of acommunication line, and constitutes a specialized improvement over thetransposition device disclosed in my co-pending application Serial No.475,286, filed February 9, 1943, issued August 29, 1944, as Patent No.2,356,750.

A problem encountered in the erection of communication lines adapted toconvey messages by the carrier system, is that such system requirestransposition of the two paired line wires at definite minimum intervalsthroughout each section or division of the system. If, as is usual,transposition brackets are mounted on the line poles which supportbetween them reaches of the communication wires, it is necessary forsatisfactory carrier communication that the poles be spaced no furtherthan the required minimum distance. Such exact spacing of the poles is,in many calities, extremely difficult or even impossible. In convertingfrom the phantom system to the carrier system, the problem is evengreater because poles have already been set and some of them are alwaysset throughout any extended stretch of line in accommodation to localconditions rather than to proper spacing. Exact spacing under suchcircumstances, therefore, would require withdrawing poles which havealready been set and replanting them in accordance with a requirement,which is of itself frequently difficult or impossible to meet.

The transposition device, or bracket, disclosed in my above-identifiedapplication, and which may be considered to be my standard form ofbracket, consists of a single frame element from each of the oppositesides of which project two insulators, the four insulators of thebracket being mounted in approximately rectangular arrangement, and thetwo insulators on each side of the frame, or base, element beingarranged diagonally.

A transposition bracket, such as that disclosed in my above-identifiedapplication, serves to transpose the line wires by crossing them in suchmanner as to preserve equal length and weight of copper in the reachesextending on both sides of the transposition point, and is arranged toseparate the two wires, which normally are uninsulated, a substantialdistance in their mounting on the bracket.

The object of my present invention is to provide a transposition bracketof simple construction and reduced cost, which may be used instead of mystandard form of transportation bracket the base I.

Where manufacturing or other conditions prescribe such simplicity.

'In the accompanying drawings illustrative of my invention:

Fig. I is a plan view of my transposition device, or bracket, showingtwo line wires transposed by the bracket.

Fig. II is a view showing the transposition bracket of Fig. I partly inside elevation and partly in central vertical section.

The transposition bracket of my present invention is, as above noted,simple in structure- It consists primarily of a relatively thick andrigid plate, or base, I, which desirably is a steel or iron stamping,but which may be made of any other metal or other material formed insuitable manner, provided, however, that it provides in the bracket astiffness and tensile strength adequate to sustain the pull of a pair oftensioned line wires applied to the bracket in the manner hereinafterdescribed. Mounted on the base i and projecting from the same sidethereof in alignment longitudinally and horizontally of the base are apair of identical wire-contacting and wire-training insulators 2 and 3,each of which is provided with two wire-receiving grooves, 4 and 5 ofthe insulator 2 and 6 and l of the insulator 3. These insulators may bemade of glass, porcelain, or any other suitable insulating mate rial,and may be of any desired spool form to provide specialized insulatingconditions in the assembly. As shown, however, they are doublegroove,spool-form insulators of the simplest structure.

Insulators 2 and 3 are rotatably mounted on As shown, their mountingconsists of insulator pins 8 having heads 9 and provided with threadedshanks l0 carrying nuts H. Any suitable. form of insulator pin may,however, be used, provided that it is of substantial diameter and iscomposed of a suitable high tensile strength material, such ashigh-carbon, heattreated steel, in order to resist the stresses to whichit is subjected in service. To make the insulators 2 and 3 freelyrotatable on the insulator pins 8 without undue looseness, I interposebetween the insulator pins and the bores of the insulators, bushingsleeves l2, and provide a slight clearance between the insulator boresand the surfaces of the sleeves. The sleeves l2 desirably are made oflead, or other suitable bearing metal.

In efiecting transposition of a pair of continuously strung line wiresby means of this bracket, the bracket is introduced by gathering theslack of the wires in a reach of the line between poles and working thebracket into transposing position between the wires, utilizing the slackfor transposition. In transposition of the wires, shown best in Fig. Iof the drawings, one wire, designated as wire A, is worked around theinsulator-2 to-.liein the uppers-groove lthereof, and is also broughtover and oppositely around the insulator 3 to lie in the upper groove 6of that insulator. Similarly, line wire B is worked first aroundinsulator 3 to lie in the lower groove 7 thereof, and is also broughtover and'oppo'sitely around the insulator 2 tolie in its lowerzigroove5. The wires thus are symmetrically -.-crossed within the space boundedlongitudinally of the line by the diameter of the insulators at the baseof their grooves and transversely of the line by the distance betweenthe bases of the :opposed grooves of the insulators. They are spacedvertically by thedistance between thedeepestpoints of the grooves ineach insulator.

This, as appears inzFig. I of thedrawings, effects transposition of thewires, andtheoverall length ofthebracket from the bases of theinsulator. grooves being equal to the desired spacing of the line wires,the bracket tightens and ac- .curatelyspaces the wires, in-addition: toits func- :lZlOl'l vof transposing them.

In this transposition .bracket, two insulators only being used to effectthe-transposition, it is important that the insulators berotatablymountedin order that the bracket:may be brought into accurate positionina reach of .theline wires between poles toequalize the distancebetweentrans position points along the line. rotatable mounting of theinsulators, it is possible to draw the bracket intosuch accuratelyspaced position-by meansof a come-along, .or

other suitable instrument, inasmuch as the insulators mayturnto-relievethe binding of the wires thereon astthe bracketisbrought-intoits final desired position. Desirably, there being a closesnubbing of the wires-by the bracket, the

bracketis mounted on the -wires'as close ,aspossible to itsdesired finalposition, and .as-much slack as possible isprovided for thelateralwiretransposing insertion of the bracket.

.In-spite of the relief afforded by rotation of the insulators as thebracket is drawn along.theiline into itsfinal position, it is importantthat the base .i and the insulator pins .8 be particularly strong andrigid by virtueof thein dimensions and the material of which they areformed. :ThlSiiS ,for-thereason that-the insulators, projecting as.theydo both from the same side of the base, the strainof the wires ,inworking the bracket into position is.unbalanced and exerts a severetendency to bend the base and to bend or break the jnsulator .pins. .Byusing, .however,,. high tensile ior the standard 8-inch spacing of 'thepaired wires of communication lines.

Because of the :71."

It is apparent from the transposing position of the wires that theinsulators 2 and 3 must be of substantial dimensions with respect to thespacing of the paired wires A and B. Thus with the standard 8-inchspacing, the diameter of the insulators at the bases of their groovesshould be at least 1 inches, and desirably is as great as is;possiblewhile leavingspace between the insulators for crossing thewires. This is to permit the wires to be crossed into their transposedposition in the line. In order that the wires may be"separateda'dequately from each other in the verticalcdimension, thespacing between the bases,

.ordeepest points, of the grooves of each insulator .ishould' be notless than 1 inch, and desirably is .as great as may be had without soincreasing the unbalanced stresses on the insulators as to bend .or,break their mounting pins.

Having described a specific embodiment of a transposition. bracket. inaccordance withimy invention, it. isto beaunderstoodthat the inventionherein is not to be strictly limited to the specific structural detailsas shown and described, but that .ably n'iounted in longitudinallyspaced alignment on the said base, .the. greatest distance between Sill.moi the said two insulators. at.the bases of the grooves therein beingconformed to the norspacing of thepaired line wires and the diametcr ofthe insulators at the bases. of the said grooves being substantial-togive an angularly crossed position between the insulators to the twoline wires trained each on opposed surfaces'in aligned grooves of thesaid two insulators, the angularityof thecrossed wires to the parallelreaches of'the line defined by the groove 'diameter'of the saidinsulators being sufficient for adjustment of the'bracket along the lineby rotation 01" the said insulators.

'2. A wire-transposing and-wire-spacing bracket for pairedline wires inaccordance with the definition of clairn'l in-which-therotatablemounting of the insulators is provided by insulator pinspassing through bores in the insulators, and bearing sleeves in'theinsulator bores and surround- .ing' the said insulatorpins.

ROGERS CASE.

.REFlE-RENCES CITED ihe"following referencesare of record in the ine ofthis patent:

UNITED STATES 'PATENTS iiumber Name .Date

402,810 .Denver :May 7,1889 110,206 OBrien -Sept..-30, -1'902 731,239Sorg June 16, 1903 2,356,750 Case .Aug. .29, .1944

